body {
  margin: 0;
  overflow: hidden;
}

canvas {
  background-image: radial-gradient(#666, #333);
}

#instructions {
  position: absolute;
  color: #fff;
  bottom: 0;
  padding-bottom: 6px;
  font-family: sans-serif;
  width: 100%;
  text-align: center;
  pointer-events: none;
}
